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Old 10-13-2017, 06:49 PM   #1
wdchparks
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Join Date: Mar 2005
Location: middleboro, Massachusetts
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2006 Highlander P0420

2006 Highlander, 4Cyl, 110,000 miles, new plugs, new air filter. Code P0420 reset several times comes back. Read a lot from some knowledgeable people seems code is not defined as replace cat. I don't mind sending it to dealer for better tests than my scan tool, I just want to know what to ask for. I don't want to replace the O2 sensors since at that point costs add up.

Tires have proper air pressure, gas tank is full, and windows are up.

Thanks for any help
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